Big Horn, WY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Big Horn, a community in Sheridan County, Wyoming.
Tonight
53°F
Showers And Thunderstorms
Showers and thunderstorms before 3am, then a slight chance of showers and thunderstorms. Mostly cloudy, with a low around 53. West southwest wind 0 to 5 mph. Chance of precipitation is 80%.
7-day forecast for Big Horn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Showers And Thunderstorms | 0 to 5 mph WSW | 83% |
| Saturday | 66°F | Patchy Fog | 0 to 5 mph NW | 93% |
| Saturday Night | 48°F | Showers And Thunderstorms | 0 to 5 mph NW | 87% |
| Sunday | 63°F | Showers And Thunderstorms | 0 to 6 mph N | 86% |
| Sunday Night | 45°F | Chance Showers And Thunderstorms then Mostly Cloudy | 0 to 3 mph NNW | 38% |
| Monday | 70°F | Partly Sunny then Chance Rain Showers | 0 to 5 mph ENE | 26% |
| Monday Night | 48°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 77°F | Sunny | 0 to 3 mph ENE | 4% |
| Tuesday Night | 52°F | Partly Cloudy | 1 to 6 mph S | 13% |
| Wednesday | 79°F | Mostly Sunny then Slight Chance Rain Showers | 1 to 5 mph NW | 22% |
| Wednesday Night | 52°F | Mostly Clear | 3 mph SE | 5% |
| Thursday | 81°F | Sunny | 2 to 6 mph SSE | 6% |
| Thursday Night | 53°F | Partly Cloudy | 3 to 7 mph S | 1% |
| Friday | 82°F | Mostly Sunny | 3 mph SE | 8% |
Forecast source: National Weather Service (api.weather.gov) for Big Horn (44.679, -106.997). Updated through the day.
Growing snapshot for Big Horn
Last spring frost
May 24
First fall frost
Sep 23
Growing season
120 days
Hardiness zone
5a
More local growing data for Big Horn: nearby ZIP 82842 weather · frost dates · planting calendar · Wyoming frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Story, Wy (1.7 mi from Big Horn). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.